Abstract
Application of newly-developed water-soluble singlet oxygen sources in the oxidation of biologically important compounds and the electron-transfer process involving singlet oxygen has been reviewed. Particularly, oxidation products of tryptophan by chemically generated singlet oxygen were compared to those obtained in dye-sensitized photooxygenation. The usefulness of trimethylsilyl cyanide as a trapping reagent for dipolar peroxide intermediates has been demonstrated in the photooxygenation of N-methylindoles, 2-(methoxymethylene)adamantane and adamantylideneadamantane in aprotic solvents. Based on these trapping reactions mechanism of singlet oxygen reaction of electron-rich enol ethers and enamines is discussed in light of theoretical calculation.
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